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NEET 2018
Exam
NEET
Year
2018
Subject
Physics
Chapter
Waves and Sound

NEET 2018 · Physics · Waves and Sound

A tuning fork is used to produce resonance in glass tube. The...

A tuning fork is used to produce resonance in glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of 27oC{27}^{o}C two successive resonances are produced at 20cm20cm and 73cm73cm of column length. If the frequency of the tuning fork is 320Hz320Hz, the velocity of sound in air at 27oC{27}^{o}C is

Options

  1. A350ms−1350m{s}^{- 1}
  2. B339ms−1339m{s}^{- 1}
  3. C330ms−1330m{s}^{- 1}
  4. D300ms−1300m{s}^{- 1}

Correct answer

B. 339ms−1339m{s}^{- 1}

Step-by-step solution

In resonance tube experiment,

Speed of sound v=2f(l2−l1)v = 2f\left({l}_{2} - {l}_{1}\right)

=2(320)×(0.73−0.20)= 2\left(320\right) \times \left(0.73 - 0.20\right)

=(640)×(0.53)=339.2ms−1= \left(640\right) \times \left(0.53\right) = 339 . 2m{s}^{- 1}

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